A question mark remains over Adam Perry's fitness after the nuggety hooker failed to recover from a calf injury for the Bulldogs' NRL clash against Parramatta at Telstra Stadium on Saturday night.

Perry hasn't been sighted since bowing out against Wests Tigers five weeks ago and won't be considered until round nine as the Bulldogs look to build on last weekend's thrilling 24-20 win at Newcastle.

Bulldogs coach Steve Folkes has enough injury woes with prop Mark O'Meley this week learning he will be out for 16 weeks - not 12 as first thought - due to ruptured knee ligaments suffered in Australia's Test win over New Zealand at Brisbane.

But O'Meley said 10 weeks was a realistic recovery period.

"It fluctuates. The doctor won't put a time on it because it is ligament damage," he said.

"I've got to be in a brace for six weeks without any movement then see how the progress is.

"It could be anywhere between 12 and 16. But it's hard to predict how some people recover - I could be back in 10 or I could be back in 14." It is the same knee O'Meley was nursing after suffering medial ligament damage while playing for Australia in its end of Tri Nations tour Test win over the United States.

"I've just got to take the impact off it and just play it by ear. I've got to make sure it heals properly," he said.

Apart from O'Meley and Perry, the Bulldogs are without Test prop Willie Mason (foot; round 20 return) and Sonny Bill Williams (ankle; round 12).

The Bulldogs (12th; 2-4 record) broke a four game losing run with the last gasp win over Newcastle and will be confident when they line up against Parramatta (8th; 4-3).

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